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l @uiten glatte' )Entrant @frn i JAMES BURNS, lOF NEW YORK, N. Y., ASSIGNOR T0 HIMSELF, RICHARD MCGULLOUGH, AND JOHN FANNING.

Letters'Patent No. 78,512, datecZJcme 9,1868.V

IMPROVED MACHINE FOR SHAVING SGR-EWS.

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To ALL WHoM I'r MAY "ooNcERN:

Be it known that I, JAMES BURNS, of the city, county, and State of New York, have invented a new und useful Improvement in Machineryffor Making Wood-Screws; and do hereby declare that the following is a full and exact description there-of, reference beingA had to the accompanying drawings, making part of this specification, of whichv i Figure 1 is a top view of the machine.

Figure 2, a horizontal section.

Figure 3, an elevation'of the feed-end.

Figure/1, a vertical and transverse section.

Figure 5, a front elevation. A

Figure 6,4 sectional view of spring-guide.

Figure 7, a sectional View, representing the griping-jaws closed, and holding a screw-blank, and

Figure 8 a view of same, with jawsextended after discharge of the blank,

Y lhis invention relates to an improvement in machinery for making wood-screws, but principally to that portion employed for turning off the head of the screw-blank, technically termed theshaver, and consists of an oscillating and reciprocating carriage, which carries a griping holder up to a spring-guide, (into which the screw-blnnk is fed b y its own gravity,) and seizing the screw-blank, carries the same upto a stationary tool, and holds it during the operation of shaving the head of the screw-blank, and after the operation discharges the shaved blank, dispensing with the use'of a punch for feed or discharge of the screw-blank. i

The movements of the carriage and griping' holders, which render the machine automatic, are performed by the aid of cams on a carrying-shaft, as will behereinafter explained.

In the said drawings, A indicates the frame of the machine, B the driving-shaft, and C the cam-shaft. 0n the driving-shaft is placed a pinion, D, which drives a wheel, E, fastened ron the cam-shaft, and on said drivingshaft-is a wheel, F, which meshes into a pinion, G, by means of which the hollow trumpetshaft H, containing the griping .holdeigis rotated.` J represents the oscillating and reciprocating carriage, placed on and swinging loose'on the,drivingshaft. The` oscillating movements of this carriage (or the .movements transversely of the driving-shaft) are performed by means of the 'cams K K', ixed on the camshaft C, being brought, at each revolution of the cam-shaft, alternately in contact'withadjustable stops L L, projecting from the lower end of the earriage,'(see fig. 4,) said oscillating movements being for the purpose of enabling the griping-jaws placed on the upper side of the carriage, after seizing the 'screw-blank, izo-carry it up to the tool, and, after the shaving operation, return for the next blank. l l y *l On 'the cam-shaft C is {ixed a gr'ooved cam-wheel, M, having on its inner side a cam or projection, N. This projection, at each revolution of the Cain-shaft, is brought in contact with an arm, O, projecting' downward from the carriage, by means of which, and a spiral spring, o', on-tlic driving-shaft, the reciprocating movements of the carriagelor movements longitudinally of the machine) are citeetcd", this reciprocating movement of the earringe being for the purpose of bringing the griping-jaws up to the spring-guide,`and receding with the screwblank. v f l On the upper en d of the carriage J, and supported in suitable bearings, is the hollow trumpebshaft H I-I,

containing the griping-jaws R R, and sliding shaft S, (see gs. 7 and 8,) said jaws being connected with said sliding shaft by means of the links t t. These griping-jaws are closed and extended by means of the cam-wheel M operating n forked lover, U, which in turn operates the sliding shaft S by mea-ns 'of a pin, W, which works in a slot, w, in the trumpet-shaft. Said pin proec'ts through the sliding shaft, and through a grooved c ollar,'X, embraced by the arms of the forked lever U. Y is the spring-guide, into which the screw-blanks are fed by their own gravity. Thisv spring-guide, which slides in-to ways ou top of the framed, is a tube, and is smaller in diameter at its-discharginglend than the interior o i the tube or the head ofthe scrcw-blank. It is also slit v at intervals at-said end, (see figs. 1, 6.) By this arrangeinent the screw-blank will not pass through the end of the tube, but will be held until seized by the' griping-jaws, the slit'end of theV tube opening as the 'blank is drawn forth, and closing again to, retain the nekt'blank-in position.

a isa tool-post, slid into ways on the franie A, and supports-the stationary shaving-tool b, and lc is its setscrew for holding said tool in place.

' The operation of my shaver is veryfsimple, andis as follows;

The screwblanks being 'fed' by their own gravity, as already-explained, the rst blank to be operated on is held by its head, by the spring-guide, until the reciprocating movement ofl the carriage J brings the gripingl jaws R R. up to the screw-blank, (saidjaws being-extended as they approach' the screw-blank, by means of the l sliding shaft S, forlted lever U, -and cam M,) when the jaws will'embrace the screw-blank firmly, and draw the blank from the spring-guide as the carriage recedes. Next,'the oscillating moveinent of the carriage will bring lthe griping-jaws, with the screw-blank, up to the stationary tool l, and rotate the blank against the tool until theblank-liead is shaved, when thenext oscillating movement of the carriage will "bring the blank away from the tool, the griping'fjaws be again extended, the blankv dropped, and the jaws brought up to draw the next blank from the spring-guide, and so on.

Having described my invention, what I claim, and desire to secure byLetters Patent, is

1. I claim, in combination with the stationary tool b and spring-guide Y, the forked lever U, cani M, and

griping holders R R, for taking the screw-blank from the spring-guidc, holding, bringing up, and rpt-ating saue against thetatio'nary tool during the operation of shaving the blank-head, and discharging the blank without the aid of a'puncli, for either vfeed or discharge lot' the screw-blank, substantially as described.

2. I claim the combination ofthe oscillating 'and reciprocating gripingho`lder carriage J, cams K K N, and spring O, arranged substantially as and forv the-purposes set forth and described.

.fn testimony whereof, I have hereunto set my signaturefthis twentieth day of March, A. D. 1868.

JAMES BURNS.

Witnesses:

ARTHUR NEILL, WM. MILLER. 

